Average Bench: 77.6% (60th of 113)

Based on 747 user benchmarks.  Model: Corsair CM4X8GF2666C18S2 2x8GB

Good average bench

The Corsair CM4X8GF2666C18S2 2x8GB averaged 22.4% lower than the peak scores attained by the group leaders. This is an excellent result which ranks the Corsair CM4X8GF2666C18S2 2x8GB near the top of the comparison list.


Avg. 16 Core Read Bench 30.8GB/s
Avg. 1 Core Write Bench 28.4GB/s

Good consistency

The range of scores (95th - 5th percentile) for the Corsair CM4X8GF2666C18S2 2x8GB is 27.2%. This is a relatively narrow range which indicates that the Corsair CM4X8GF2666C18S2 2x8GB performs reasonably consistently under varying real world conditions.


Avg. 1 Core Read Bench 17.5GB/s
Avg. Physical RAM Latency 71.2ns

Average Bench

(Based on 747 samples)
Min Avg Max
24.4 MC Read 30.8 35.8
19.8 MC Write 28.4 34.7
19.9 MC Mixed 23.4 30.7
78.6% 27.5 GB/s
Min Avg Max
11 SC Read 17.5 22.6
16.7 SC Write 28.4 35.3
13.6 SC Mixed 24.2 28.8
66.8% 23.4 GB/s
Min Avg Max
56.9 Latency 71.2 94.7
56.2% 71.2 ns
User Benchmarks Bench Multi core Single core Latency
The fastest RAM (mainstream) averages a speed of 100%
2 of 4 slots used
16GB SODIMM DDR4 clocked @ 2667 MHz
MC Read 31.8
MC Write 29.7
MC Mixed 22.2
80% 27.9 GB/s
SC Read 18.1
SC Write 30.8
SC Mixed 26.9
72% 25.3 GB/s
Latency 56
71% 56 ns
2 of 2 slots used
16GB SODIMM DDR4 clocked @ 2667 MHz
MC Read 31.4
MC Write 30.8
MC Mixed 22
80% 28.1 GB/s
SC Read 17.7
SC Write 31.3
SC Mixed 23.7
69% 24.2 GB/s
Latency 61.8
65% 61.8 ns
2 of 4 slots used
16GB SODIMM DDR4 clocked @ 2667 MHz
MC Read 29.7
MC Write 27.8
MC Mixed 22.5
76% 26.7 GB/s
SC Read 5.6
SC Write 9
SC Mixed 7.8
21% 7.47 GB/s
Latency 62
64% 62 ns
2 of 4 slots used
16GB SODIMM DDR4 clocked @ 2667 MHz
MC Read 18.1
MC Write 12.1
MC Mixed 13.5
42% 14.6 GB/s
SC Read 12.1
SC Write 29.3
SC Mixed 24.8
63% 22.1 GB/s
Latency 81.7
49% 81.7 ns
747 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 32,846,230 RAM Kits tested.

Typical CM4X8GF2666C18S2 2x8GB Builds (Compare 138 builds) See popular component choices, score breakdowns and rankings.
Gaming 14%
Tree trunk
Desktop 80%
Aircraft carrier
Workstation 13%
Tree trunk

System: Schenkertechnologiesgmbh XMG FUSION 15 (XFU15L19)

EDIT WITH CUSTOM PC BUILDER Value: 77% - Very good Total price: $179

Popular CM4X8GF2666C18S2 2x8GB systems:

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  • - CPU tests include: integer, floating and string.
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Memory Kit Rankings (Price vs Performance) September 2020 RAM Rankings.

We calculate effective RAM speed which measures performance for typical desktop users. Effective speed is adjusted by current cost per GB to yield value for money. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top Memory Kits. [RAMPro]


Group Test Results

  • Best user rated - User sentiment trumps benchmarks for this comparison.
  • Best value for money - Value for money is based on real world performance.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.


113 Memory Kits (Compared) Thousands of user benchmarks compiled into one comparison list.

See how consistently different RAM Kits perform with varying real world conditions. The charts also illustrate overall performance, popularity and rank.

 Frequently Asked Questions

 Best User Rated

The Best.
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Intel Core i7-9700K $290Nvidia RTX 2070S (Super) $505Samsung 860 Evo 250GB $42
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